Is "doing business" spiritual?
Of course it is.
When you do spiritual business you earn spiritual money (just kidding).
Money is simply another form of energy, not less holly than any other energy.
It is true that the intention is different but all aspects of existence have a role to play in our lives.
Discarding a part of creation is not an option.
Society, civilization, life on this planet are the result of a very subtle equilibrium.